Telegraph system



Dec. 1, 1931. M. B. KERR TELEGRAPH SYSTEM iled July 26. 1929 INVENTOR MARK B KERR BY y ATTORNEY W mUnwnrUUUWUUUmunmRmummUUUnmBUUFUUGEUUUMUUUBHWUUUW Patented Dec. 1, 1931 UNiTen STATES PATENT ent ce MARK B. KERR, or GRASMERE, nEwYoR-K, ASSIGNOR TO INTERnATIo eL CQMMfiNi- CATIONS LABORATORIESINCORPORATED, OF NEW YORK, N. Y.,,1 i ,coRPBATI0N OF NEW YORK Application filed July 26,

This invention relates to telegraph systems and more particularly to receiving systems adopted for long telegraph lines The invention provides method and means whereby transmitted signals may be correctly received at the receiving stationeven al- I though the speed of transmission is increased beyond that point at which each unit impulse, Whose characteristics have undergone a m change due to the electrical constants of the line, can effect operation of a line relay, even after amplification.

In the drawing comprlsing but a single 'f sheet of one figure, is shown schematically a f: v I

co ne t d te nd ctoi onth Wtindingof relay'l through a resistanceito portion of the equipment which maybe arranged at a telegraph station for, effecting reception of signals inaccorda present invention.

In the embodiment of the inventi on disgo closed herein, a relay 1 ispro 'ded asa. part of the receiving equipment under the control of a distribu Whether any signalsarebeim transmitted 25 to such receiving equi p1nent onnota distributor rotates synchronously; with a distributor at the station .fromf which signals may be sent. 7

The two polar a0 n ing an iii-respective th ine-#011submarii eg ebl4 1- ,ar n ovi a so with the respective windingswtl,andfi. reasonot aweak current normalllv flowgins! through the .win'dingsi 6 and; g frorn the ba tcr 8 a mat-u ea ant 'lO-a eheklaeains .tl e re ne fiv ont 1. .121 d1 21 -When tb current flowing-through windings 4 and. 5,i s

position of armature 13I' neeiw th th lament; h are. n ec 1n wsw h the; ntn ite 'ii m l fi dmit-ejd' ir n t th -impul es re i ed ve TELEGRAPH SYSTEM 19, and with segmented consistin i' of series of groups' of segments 22," 25,2128. The 'brushfil' is adapted to pass over four successive segmentsduring the time of transductor26 through resistance 24 to ground;

fse im'e'nts2 5are connected a common conductor 23 to conductor l4 segments have ernal connection and segments 28 are piround. Now as brush 21' connectsa ment to ring 18. positive potential from 'ent .25,f condenser is negatively .ed and this eharge qvhen the I, V vhesthtnext se ment 28, ener rizes .relav ndarmatnre lgmoves th eleft and in contactsavith' contact ,16; This cvcleofon- .erations will continue, tbuskeening armature 31 in constant vibration so. long asno impulses are being received.

properly amplified at thereceiving station,

of" single 5 unit impulses, positive, negative,

positive and negative, these impulses wvould he supplied by the normal operation of relay 1 through conductor 14 to ring; 15 and thence to Which is connectedthe grounded condenser batter v 30 'Will be impressed on condenser 1,; f19thi1shchtirqinq it." Wlmn thebtush infofiv h ck; rela r .isnoririixlly in a vibrating conditionglf regardlessfgof if ch17, V In'thisfnositionjn Willnotv be blacedon conduct 1 14:. mienfthejbrushfl reaches the sedtrlent anyresidualfcharde lettin' the 'conde s er w l be i i fil W-Qh The brush thenireaches 1 v v Since thespeed of transmission is soagreat m by means of brush 31 through segments 32;,

successively which arewpermaneiitly connect ed to receiving printer magnets or storing relays.

Should, however, a signal be made up of positive, positive, negative and positive impulses, then, although relay 2 has not operated by reason of the first positive impulse, whichwill be filled in by relay 1, it will become operated due to the continued applica tion of positive current. Its operation will cause its armature9 to move to the right, and positive potential is thus maintained on ring 15 from battery 30 over contact 33. The polarity of relay 8 is such that its armature 10 does not move from contact 12 on positive impulses.

During the first positive impulse when brush 21 connected segment 25 with ring '20, condenser 19 became charged, just as though no signals in fact were being received. The condenser then discharged over segment 28 through the winding of relay 1 and armature 13 moved to the right and engaged contact 17. But inasmuch as armature 9 at this time had already moved from contact 11, negative potential from battery 8 is not communicated at this time to conductor 14:.

During the second positive impulse, condenser 19 is again charged, but upon the subsequent discharge the armature 13 of relay 1 remains against contact 17 as the discharge is of the same polarity as that which caused the next preceding movement of the armature.

Now toward the end of the second impulse, as a change is being made frompositive to negative signals, there will be a falling off in current strength, and a point will be reached where the current through windings 6 and 7 of relays 2 and 3 respectively is stronger than that through the line windings. Under such a condition, armature 9 will move to the left and re-engage with contact 11. Negative potential is at once supplied to conductor Hover the following path,

battery 8, contact 17, armature. 13 contact 11, armature 9, contact 12, and. armature 10. Thus the connection of negative potential to the ring 15 precedes the actual arrival of the negative impulse from the transmitting station, or takes the place of such impulse it it is not received or is not sufficiently well defined to effect the operation of one of the two line relays.

Each character or symbol consists of a series of positive, negative, or positive and negative impulses in combination. A single unit impulse is a current impulse of either positive or negative polarity impressed upon the circuit for a predetermined unit of time. A double, triple, (eta) unit impulse is a succession of impulses of like polarity impressed upon the circuit for two or three (or more) time units.

Claims:

1. In a telegraph system, means responsive toline signal impulses, a condenser, a distributor, a circuit closed under control of said distributor for charging said condenser, and a relay, a discharge circuit for said condenser including the winding of said relay closed under control of said distributor whereby said relay is energized Wholly independent of whether or not line signal impulses are being transmitted through said system.

' 2.In a. telegraph system and in combination a first relay means, a second relay means, and means including a condenser for maintaining the armature of said first relay means in a state of vibration when said second relay means is unoperated.

'3. "In; telegraph receiver, selector means, a pair of normally biased polar relays, each of said relay having an armature adapted to respond to signal currents, a vibrating relay, and an operating circuit for said selector means controlled by said vibrating relay and extendin through the armatures and contacts of said polar relays whereby the current in said operating circuit is reversed by the operation of either of said polar relays.

4. In a telegraph system a distributor, a local relay, a condenser, said local relay being arranged to vibrate under the influence of said distributor and condenser, and a line relay arranged to render said distributor and condenser inefi'ective to operate said vibrating relay.

5. In a. telegraph receiver, a vibrating relay, 2. source of potential having opposite poles connected to the contacts of said relay,

. a pair of biased polar line relays, and a distributor ring, each of said line relays being operable to connect either positive or negative potential to said distributor ring and to arrest the action of said vibrating relay so as to retain the armature thereof on a contact of opposite polarity to that on said distributor ring.

6. In a telegraph system, the combination of a pair of receiving relays, and a vibrating relay having an operating circuit which is under the control of its own contacts and said receiving relays. Y 7 In a telegraph system, a pair of normally biased polar relays, and a vibrating relay, said vibrating relay having an operating circuit normally controlled by its own contacts and being arranged to operate in synchronismwith impulses transmitted over said system. and said polar relays being arranged to selectively control said vibrating relay.

-8. Ina telegraph system, a local circuit, line relay means, a polar relay, and a distributor having a plurality of segmented rings, the segments of one of said rings being arranged in a series of groups, a first group being arranged to charge a condenser;

and a second group being arranged to cause said condenser to discharge through the windings of said polar relay, said line relay means determining the polarity of said (118- charge.

9. In combination, three relays each having an armature having two operating positions and contacts to be engaged in each of such positions, a source of positive potential and a source of negative potential, each of said sources being connected to a contact of one of said relays and to a contact of one of the other two relays.

10. In a telegraph system a transmitting station a receiving station, a transmission line extending between said stations, means at said transmitting station for sending over said transmission line signals representing a message and composed of combinations of unit impulses of positive or negative polarity auxilary means at the receiving station adapted normally to supply alternately positive and negative impulses independently of the signals sent from the transmitting station to recording apparatus located thereat, and means operative upon the arrival oi a unit impulse of the same polarity as that impulse immediately preceding to cut oil said auxiliary means from said recording apparatus, and for a part at least of the duration of said unit impulse of the same polarity to control the operation of said recording apparatus.

11. In a telegraph system, the combination with the standard two relay receiving circuit of means effective when both receiving relays are in inoperative position to supply single unit impulses.

12. In a telegraph system, the combination with the standard two relay receiving circuit of means comprising a single wound vibrating relay effective when both receiving relays are in inoperative position to supply single unit impulses.

13. The combination with the standard two relay receiving circuit of means comprising a distributor eifective when both receiving relays are in inoperative position to supply single unit impulses.

14. The combination with the standard two relay receiving circuit of means comprising a relay and a distributor effective when both receivin relays are in inoperative position to supply single unit impulses.

MARK B. KERR. 

